유구치 1급 와동에서 와동벽 위치에 따른 microtensile bond strength 비교 연구
Microtensile bond strength according to different dentin wall position in class I cavity of primary molar
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초록
유구치 1급 와동의 복합레진 수복 시 C-factor가 가장 크게 나타나며 중합수축에 의한 응력도 가장 크게 나타난다. 이 실험에서는 응력이 각 와동벽 위치에 따라 다르게 나타나는 양상을 microtensile bond strength(MTBS)실험을 통해 확인해보았다. 하악 제2유구치 20개를 두 개의 군으로 나누었다. 각각 다른 종류의 복합레진으로 수복하였고 개별 치아에서 각각 치 수벽 시편과 축벽 시편을 얻어 총 4개의 군으로 나누었다. MTBS를 측정하였으며 통계적 유의성을 student T-test를 통해 검정하였다. ZP: Filtek Z250 - 치수벽 ZA: Filtek Z250 - 축벽 SP: Filtek Supreme - 치수벽 SA: Filtek Supreme - 축벽 다음과 같은 결과를 얻을 수 있었다. 1. ZP군과 ZA군, SP군과 SA군 사이에서는 유의한 차이가 존재하였다( p<.001). 2. ZP군과 SP군, ZA군과 SA군 사이에서는 유의한 차이가 존재하지 않았다( p<.001).
Abstract
In Class I cavity, the highest C-factor could be obtained and it means the highest polymerization shrinkage stress. In this study, high C-factor model was designed. The pulpose of present study was to determine differences of Microtensile bond strength (MTBS) of class I cavity pulpal and axial wall specimens in primary molar. Twenty clean mandibular 2nd primary molars were randomly divided into two groups. Different composite Resins (Filtek Z250, 3M ESPE & Filtek Supreme, 3M ESPE) were bulk filled and photo cured. Axial wall specimens and pulpal specimens were prepared at the same teeth. All specimens were divided into 4 groups and MTBS were evaluated. Group ZP : Filtek Z250 - Pulpal wall Group ZA : Filtek Z250 - Axial wall Group SP : Filtek Supreme - Pulpal wall Group SA : Filtek Supreme - Axial wall The results were as follows: 1. Mean MTBS of ZP & ZA and SP & SA were significantly different(p< .001). 2. There was no significant difference between MTBS of ZP & SP and ZA & SA.
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